Nucleation of superconductivity in finite metallic multilayers: Effect of the symmetry |
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| Authors: | V?N?Kushnir S?L?Prischepa C?Cirillo M?L?Della Rocca A?Angrisani Armenio L?Maritato M?Salvato Email author" target="_blank">C?AttanasioEmail author |
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| Institution: | (1) Institut de Ciéncia de Materials de Barcelona, Campus de la UAB, 08193 Bellaterra, Catalunya, Spain;(2) Departament de Física Aplicada i Óptica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Catalunya, Spain;(3) Departamento de Física, CAC, CNEA, Av. Gral Paz 1499 (1650), San Martín, Buenos Aires, Argentina |
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| Abstract: | The influence of the finite dimensions of superconducting metallic multilayers on H-T phase diagram is studied. It is established that the geometrical symmetry of the samples determines crucially the
dependencies. For samples where the symmetry plane is in the middle of the superconducting layer the
values are, for temperatures close to T
c
, larger than the
values of the samples for which the symmetry plane lies in the middle of the normal layer. The results are analysed on the basis of the Ginzburg-Landau approach and are explained by considering the different symmetry of the wave function describing the system. The experimental results are in good agreement with the elaborated model, which takes into account the actual symmetry of the samples.Received: 23 July 2004, Published online: 5 November 2004PACS:
74.78.Fk Multilayers, superlattices, heterostructures - 74.20.De Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) - 74.45. + c Proximity effects; Andreev effect; SN and SNS junctions |
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